Malicious PDF — malware analysis report

Static analysis result for SHA-256 622d85d5e3748c8a…

MALICIOUS

PDF

83.7 KB Created: 2021-08-24 21:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61365e10356178d8810c413b6abf3522 SHA-1: 370174455ebaee3f7d098e05532f9667c0cba020 SHA-256: 622d85d5e3748c8a7ae16fad7de3b10c6fddfcb8403a51cb1a487a27637095f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. ClamAV detection as Pdf.Phishing.Trojan further supports a malicious classification. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/38355786634.pdf In PDF document text
    • http://chikatere.com/Upload/files/91596779449.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da32d58c5f---nipewunawareguxilon.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/16603376034.pdfIn PDF document text
    • https://tigapilar.com/upload/files/kitutizas.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/q3fe33f3a4ctkm45kbjhrfub9p/6347382191.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5sl8ip98qmc4hftduco90apin/vagojew.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/nuvupofufu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d4e9cd07931131de8e9f93cd9e17e4c4/wutinematola.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/pisudigatojezurifunaxadaw.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/kupilaniluzevuzanojof.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/nituv.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/63906704767.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/61460283221.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/51e33c71da0fe9e268c82a7840854535/mapegiluja.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xixef.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/nupukusibelamosajep.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f81572bcf---95439154803.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a40e392053d11dd555b9d7e52090b4e6/90286578776.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/99646613978.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/vujikozireriliripe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9edea51b2---xubumaxi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5be6bf3d2---jimasowolu.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/xodexexamufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=architecture+concepts+red+is+not+a+color+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 16708 bytes
SHA-256: 1165c35253657cb35fc03e81324eee33a013c0612b82e73c3e9d38cfb9516589
font_01_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 10800 bytes
SHA-256: be5d38484011a1a1e53600db2064fd3468d2fe577109b35e8799074dd6591dc3

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